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Casing and Tubing for General and Deep Well Service
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CASING AND TUBING FOR GERNERAL AND DEEP WELL
SERVICE
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SM-G meant for gerneral
and deep well service are remarkable for their
high yield and tensile strengths while maintaining
good ductility and fracture toughness.
SM-95G was developed as an
intermediate grade between N-80 and P-110 to
provide economical flexibility in designing
casing strings.
SM-125G, SM-140G,
and SM-150G offer additional
tensile and yield strengths for deep well services.
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| Grade |
Yield
Strength |
Tensile
Strength |
Elongation
min % |
Impact
Properties min Ave Value
At-50°F (-46°C) ft-lb (J) |
|
min
psi (MPa) |
max
psi (MPa) |
|
SM-
95G |
95,000
(655) |
125,000
(862) |
110,000
(758) |
|
|
|
SM-125G |
125,000
(862) |
155,000
(1069) |
140,000
(965) |
|
|
|
SM-140G |
140,000
(965) |
170,000
(1172) |
150,000
(1034) |
API
Formula |
15 (20)
(Specimen: 10 by 10 mm) |
|
SM-150G |
150,000
(1034) |
180,000
(1241) |
160,000
(1103) |
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Characteristics
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1. Tensile Strength
- The resistance to collapse and the longitudinal
high strength requirements of well casing
is becoming increasingly important with the
drilling of deeper and deeper wells. SM-125G
through SM-150G offer the high strength properties.
-
-
- 2. Mechanical Properties
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Mechanical Properties of
SM-G series are shown in above Table. SM-125G
through SM-150G offer the required high
strength properties.
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- 3. Toughness
- The Toughness of SM-G is equivalent to that
of P110, Q125.
-
-
4. Micro Structure
-
Typical micro structures
are shown in Photo. Each photo shows a well
quenched and tempered microstructure.
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Application of
High Strength Grades for Deep Sour Gas &
Oil Wells
As wells become deeper, high strength steels
are needed for effective completion. Sumitomo
can offer our high strength and high toughness
steel for such completions, and have supplied
plenty of SM-G Grades all over the world.
The smallest amount of H2S contamination
should always be taken into consideration when
looking at high strength material applications.
Fig shows the applicability of high strength
steels for sour service integrating the following
variables; H2S concentration, applied
stress level and temperature.
Sulfide stress corrosion cracking susceptibility
increases with material strength and grades
such as SM150G should never be used if H2S
is present. |
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©
2006 Sumitomo Metals - Tubular Division. All rights
reserved.
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Website
by National Webworks
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